Increase the number of vent holes to accelerate air escape from the shrink film.
Reduce the conveyor speed of the packaging machine to extend the air exhaust duration.
Raise the machine temperature to facilitate air evacuation from the film.

Lower the machine temperature — excessive heat is the root cause of film fogging.
Increase conveyor speed to shorten the film’s heat exposure time.

Reduce the temperature of the heat-sealing blade.
Incorrect seal height: the seal line should be positioned at half the height of the packaged product.
Uneven pressure on the sealing frame; adjust the horizontal level of the sealing frame.
Dirty heat-sealing blade or sealing base; clean both components thoroughly.
Damaged heat-insulating rubber pad/sticker on the sealing base; replace the insulating parts.
Insufficient sealing time: sealing pressure fades before full seam fusion; extend the sealing duration.

Machine temperature is too low — raise the temperature setting.
Conveyor speed is excessively fast — slow down the conveyor belt.
Insufficient circulating air volume inside the shrink tunnel — boost circulating airflow.

Excessive vent holes cause air to escape too rapidly, preventing full film shrinkage; reduce the quantity of vent holes.
Overly fast conveyor speed — lower conveyor speed.
Low tunnel temperature — raise heating temperature.
Weak circulating airflow — increase fan circulation output.

Oversized shrink bags for the goods; adopt smaller-sized shrink bags.
Excessively fast conveyor speed — slow down the conveyor.
Overstrong circulating airflow — reduce fan circulation volume.
Insufficient tunnel heat — raise the operating temperature.

The seal line must be set at half the height of the packaged product.
Improper conveyor height; adjust the conveyor to the correct elevation.
Incorrect sealing frame height; reposition the sealing frame vertically.
Misdirected circulating hot air inside the tunnel; readjust air outlet angles.
Overlarge shrink bags for the product; downsize the shrink bag dimensions.

Products become distorted or crushed under film tension after shrinking
Excessively high tunnel temperature — lower heat setting.
Too slow conveyor speed — increase conveyor running speed.
Undersized shrink bags for the goods; switch to larger shrink bags.
The shrink film features overly high shrink tension incompatible with the product; replace it with low-tension shrink film.